Was this an existing save from before Ultimate Belts added integration with this mod? I think I know where the bug is; confirm you have loaders enabled in mod settings, and then if you start a new save and look at the tech tree unlocks for the ultimate belt tiers, are the loaders included as an unlocked recipe properly?
I suspect I just need an extra check for third party mods' loader recipes being added to existing saves, if you can confirm that's what you're seeing - thanks!
